Multi-omic analyses of exogenous nutrient bag decomposition by the black morel Morchella importuna reveal sustained carbon acquisition and transferring.

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2019
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Abstract
The black morel (Morchella importuna Kuo, O'Donnell & Volk) was once an uncultivable wild mushroom, until the development of exogenous nutrient bag (ENB), making its agricultural production quite feasible and stable. To date, how the nutritional acquisition of the morel mycelium is fulfilled to trigger its fruiting remains unknown. To investigate the mechanisms involved in ENB decomposition, the genome of a cultivable morel strain (M. importuna SCYDJ1-A1) was sequenced and the genes coding for the decay apparatus were identified. Expression of the encoded carbohydrate-active enzymes (CAZymes) was then analyzed by metatranscriptomics and metaproteomics in combination with biochemical assays. The results show that a diverse set of hydrolytic and redox CAZymes secreted by the morel mycelium is the main force driving the substrate decomposition. Plant polysaccharides such as starch and celluloses present in ENB substrate (wheat grains plus rice husks) were rapidly degraded, while triglycerides were accumulated initially and consumed later. ENB decomposition led to a rapid increase in the organic carbon content in the surface soil of the mushroom bed, which was thereafter consumed during morel fruiting. In contrast to the high carbon consumption, no significant acquisition of nitrogen was observed. Our findings contribute to an increasingly detailed portrait of molecular features triggering morel fruiting. This article is protected by copyright. All rights reserved.
Reference Key
tan2019multiomicenvironmental Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Tan, Hao;Kohler, Annegret;Miao, Renyun;Liu, Tianhai;Zhang, Qiang;Zhang, Bo;Jiang, Lin;Wang, Yong;Xie, Liyuan;Tang, Jie;Li, Xiaolin;Liu, Lixu;Grigoriev, Igor V;Daum, Chris;LaButti, Kurt;Lipzen, Anna;Kuo, Alan;Morin, Emmanuelle;Drula, Elodie;Henrissat, Bernard;Wang, Bo;Huang, Zhongqian;Gan, Bingcheng;Peng, Weihong;Martin, Francis M;
Journal Environmental microbiology
Year 2019
DOI
10.1111/1462-2920.14741
URL
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